Telemeter.



O. BPPENSTEIN.

TELEMETER.

APPLICATION FILED J'ULY 5,1912

Patented July 15, 1913.

U I/ ia IIITED dTATEg PATENT @FFIQEE.

OTTO E'PPENSTEIN, OF JENA, GERMANY, ASSIGNOR TO THE FIRM OF CARL ZEISS, OF

JENA, GERMANY.

TELEMETER.

Specification of Letters Patent.

Patented July 15,1913.

Application filed July 5, 1912. Serial No. 707,904.

telescopes and present both images for si-- multaneous monocular or binocular observation and the objective prisms of which are rarried by an outer tube and the objective lenses of which along with the ocular prism system by an inner tube. According to the present invention this inner tube is to be capable of being adjusted in such a. manner that there results a rotation in a plane perpendicular to the sighting plane and parallel to the base-line. Such a rotation displaces the two images in the direction perpendicular to the base-line, one image in the opposite direction to the other. This displacement canbe utilized for the compensation of an error in the relative position of the images as to the direction mentioned, with a horizontal base-line, therefore, of a so-called height-error. In the case of a incidence telemeter, one image of which is inverted and bounded above and below in horizontal lines by the other image, the said displacement of the images can also serve the purpose of bringing about a change of the locus of coincidence according to Patent 1,016,325.

It is not necessary to so dispose the adjusting device that the rotation of the inner tube caused by it takes place only in the plane mentioned. For when the rotation is made u of a partial rotation in that plane and oi a simultaneous partial rotation'parallel to the sighting plane, this latter partial rotation has no other influence on the course of the rays than a rotation of the entire instrument in the sighting plane.

In order that warping of the outer tube may not be transmitted to the inner tube, it usual to journal the latter yieldingly at one end; to obtain the desired rotatability, it is then only necessary to fit at the other end as well of the inner tube an adjusting device, by mean of which the inner tube is moved at this end in such a manner that a component'of its path lies in a plane, which is perpendicular to the sighting plane and parallel to the baseline.

In the annexed drawing: Figure 1 is a horizontal axial section through a telemeter constructed according to the present invention. Fig. 2 is a cross-section on line 22 through the adjusting device of Fig. 1. Fig. 3 is a vertical axial section through another constructional form of the adjusting device. Fig. 4 is a cross-section through a third form of the adjusting device.

In the coincidence telemeter, Figs. 1 and 2, which presents two erect images, the objective prisms a a are journaled in the outer tube Z), the objective lenses 0, c and the separating prism system d, d in the inner tube 6. The inner tube is universally journaled at the left-hand end in the outer tube by means of the ring f, at the righthand end it is journaled with three rollers g in a ring 12., which can be shifted on two guides 7) perpendicularly to the sighting plane. In order to obtain an especially fine adjustment. the set-screw i is formed as a differential screw.

In Fig. 3 the right-hand end of the inner tube rests with semiglobular projections e in a ring This ringis journaled in the outer tube on an axis, which lies outside the plane of the projections 6 in the sighting plane and perpendicular to the base-line. Through turning the set-screw Z the ring 72 can be tilted by means of the wedge-shaped piece 70 fixed to it and thereby the endor" the inner tube raised and lowered. M

In Fig. 4 the inner tube rests at the ri "hthand end in an eccentric ring m, whic is rotatably journaled in the outer tube and may be adjusted by means of a worm n. T he rotation of the inner tube is in this case made up of a partial rotation in a plane perpendicular to the sighting plane and parallel to the base-line and of a partial rotation in the sighting plane.

I claim:

In a telemeter comprising an ocular system, an ocular prism system, a measuring device, an outer tube carrying at either end an objective prism system and an inner tube carrying at either end an objective lens, the plane perpendicular to the sighting plane cplmbingtion witlliO theE said oufter tube and and parallel to the base-line.

t e sai inner tu e 0 means or causing a displacement of the said inner tube rela- OTTO EPPENSTEIN" 5 tively to the said outer tube, at least a com-i Witnesses:

ponent of the path traced by the said inner PAUL KRi'iG-ER,

tiibe during such displacement lying in a FRITZ SANDER. 

